Utilization for a triple-layer phoswich detector for beta spectral stripping Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/44558h74w

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  • To quantify the relative activity contributions of beta emitters in mixed emission source spectra, the triple-layer phoswich detector was modeled to generate beta energy absorption spectra from mixed beta sources. These mixed sources include four pure beta emitters (C-14, Tc-99, Sr-90, and Y-90). Monte Carlo N-Particle (MCNP) computer code was used to simulate electron energy absorption in the first and second layers (beta detector). A spectral stripping technique was developed to de-convolve the multi-response distribution (beta energy absorption spectrum) into its component parts for the identification and quantification of its constituent radionuclides. The method provided reliable results in identifying the studied radionuclides and determining their relative combination of source activity. The results revealed variations in percentages between the original emission and collected spectra that was found to be less than 2% in all studied spectra. Those variations were believed to be attributed to some degree of uncertainty in the spectral stripping method and some energy loss prior to detection.
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